Sindarin 

borondir

masculine name. ?Steadfast-man

A soldier of Gondor who lived 500 years before the War of the Ring (UT/297). The initial element of his name may be (ON.) boron “steadfast” and its final element appears to be dîr “-man” (as suggested by David Salo, GS/344).

Sindarin [UTI/Borondir] Group: Eldamo. Published by